London’s period properties deserve windows that balance heritage aesthetics with modern performance, yet finding the right timber casement windows specialist can feel overwhelming. Many homeowners struggle with poorly fitted windows, draughty frames, and contractors who don’t understand conservation area requirements. The worst part? Subpar installations that compromise both your property’s character and energy efficiency.
But here’s the solution: the top 4 timber casement windows London specialists who deliver exceptional craftsmanship with proven track records.
1. Sash Windows London

Looking for FENSA-approved installation that brings together traditional craftsmanship and modern energy efficiency? Sash Windows London has spent over 15 years perfecting their approach to timber casement windows in London. This company understands that period properties need special attention, which is why they offer bespoke solutions with double glazing that maintains your home’s character.
What sets them apart is their GGFI 10-year insurance-backed guarantee on all installations. They craft custom arch windows for unique architectural requirements, offering both traditional timber and modern PVCu options with authentic wooden appearance. One satisfied customer shared, “Really impressed from start to finish. The price was honest and competitive, the windows are great quality.”
Their skilled craftsmen work across North London and beyond, ensuring building regulations compliance while preserving traditional aesthetics. Whether you need wooden casement windows for a Victorian terrace or energy-efficient solutions for listed buildings, they deliver high-quality results every time.
Contact
- Address: 90 St John’s Hill, London SW11 1SH
- Phone: +44 20 8397 8666
- Email: enquiries@sashwindowslondonltd.co.uk
- Website: www.sashwindowslondonltd.co.uk
- Opening Hours: Mon-Fri 9am-5pm, Sat 10am-4pm
2. London Box Sash Windows

Family-owned businesses often bring something special to home improvement projects. London Box Sash Windows combines state-of-the-art machinery with traditional values, creating double glazed casement windows that reduce energy costs while respecting period homes. Their FENSA registration ensures all work meets current building regulations.
Since establishing their reputation in conservation areas across London, they’ve become experts in balancing thermal efficiency with heritage requirements. They offer both leaded and standard glazing options, perfect for properties requiring specific architectural features. Their approach to heat loss reduction through modern technologies has helped countless homeowners lower their energy bills.
A recent review captured their service perfectly: “The quality of the windows is excellent… The installation team left my house spotless.” This attention to detail extends from their London showroom consultation through to final installation.
Contact
- Address: 341 Norwood Road, London SE27 9BQ
- Phone: +44 20 8648 4230
- Email: info@londonboxsash.com
- Website: www.londonboxsash.com
- Opening Hours: Mon-Thu 8am-4:30pm, Fri 8am-1:30pm
3. London Timber Windows And Doors

With over 30 years combined industry experience, London Timber Windows And Doors brings innovation to traditional window replacement. Their photo quote service saves time and money, letting you get accurate pricing without an initial home visit. This modern approach appeals to busy London homeowners who value efficiency.
They specialise in European Redwood timber casement windows with glazing bars, engineered for 60+ year service life. Four coats of Teknos micro-porous paint mean you won’t need recoating for a decade. When maintenance time comes, their water-based paint system allows easy repainting without stripping old layers.
Covering all London conservation areas, they understand exact specifications required by planning authorities. Their free advice service helps navigate regulations while ensuring your new windows meet the highest standards for both thermal insulation and traditional design.
Contact
- Address: 505 Kingston Road, London SW20 8SF
- Phone: +44 20 3011 1444
- Email: info@londontimberwindowsanddoors.co.uk
- Website: londontimberwindowsanddoors.co.uk
- Opening Hours: Mon-Sat 9am-5pm
4. SPS Timber Windows

SPS Timber Windows brings personalised service to every project through their on-site consultation approach. This double glazing installer focuses on high-performance timber casement windows that incorporate modern security features without compromising period aesthetics. Their 4.7-star Google rating reflects consistent customer satisfaction across West Sussex and London.
What makes them stand out is their comprehensive approach as both window supplier and installer. They handle everything from initial measurements to final fitting, ensuring seamless project management. Their professional installation team understands that new sash windows need precise fitting to achieve superior performance.
Whether you’re updating a single casement window or replacing entire bay windows, their sales team provides detailed information tailored to your specific needs. They excel at matching existing designs while incorporating acoustic glass and other modern enhancements.
Contact
- Address: 61 Revelstoke Road, London SW18 5NL
- Phone: +44 20 8879 3443
- Email: info@spstimberwindows.co.uk
- Website: www.spstimberwindows.co.uk
- Opening Hours: Mon-Fri 9am-6pm, Sat 9:30am-4:30pm
Finding the right timber casement windows London company doesn’t have to be complicated. These four specialists combine years of experience with modern technologies to deliver windows that enhance both your home’s character and energy efficiency. Whether you’re restoring listed buildings or upgrading modern homes, these recommended options provide the quality products and expert installation London properties deserve.




